New RadioHead library v1.81 available.

LoRa relevant updates: 

- slow data rate for predefined ModemConfig with Sf 4096 enabled

- AGC for all modes enabled

Download from

http://www.airspayce.com/mikem/arduino/RadioHead/index.html

1.81 2017-11-15 RH_CC110, moved setPaTable() from protected to public.
RH_RF95 modem config Bw125Cr48Sf4096 altered to enable slow daat rate in register 26 as suggested by Dieter Kneffel. Added support for nRF52 compatible Arm chips such as as Adafruit BLE Feather board https://www.adafruit.com/product/3406, with a patch from Mike Bell.
Fixed a problem where rev 1.80 broke Adafruit M0 LoRa support by declaring bitOrder variable always as a unsigned char. Reported by Guilherme Jardim.
In RH_RF95, all modes now have AGC enabled, as suggested by Dieter Kneffel.